Safe Db levels

[userfriendly]

Found this info. http://www.lowertheboom.org/trice/safedblevels.htm

Proposed safe sound levels:
85 dB and higher - prolonged exposure will result in hearing loss
90 dBA - no more than 8 hours per day (examples - lawn mower, truck traffic, hair dryer)
95 dBA - no more than 4 hours per day
100 dBA - no more than 2 hours per day (example - chain saw)
105 dBA - no more than 1 hour per day
110 dBA - no more than ½ hour per day
115 dBA - no more than ¼ hour per day (preferably less)
140 dBA - NO EXPOSURE TO IMPACT OR IMPULSE NOISE ABOVE THIS LEVEL (examples - gunshot blast, jet plane at takeoff)


The National Campaign for Hearing Health's Toxic Noise Guidelines (exposure times and decibel levels that cause hearing loss)

85 dB 8-hour period
85 - 90 dB 2-hour period
90 - 100 dB 1 to 2-hour period
100 - 110 between 2 and 15 minutes
110 - 120 less than 30 seconds
130 dB ANY EXPOSURE WILL RESULT IN PERMANENT HEARING LOSS

From http://www.lowertheboom.org/trice/decibels.htm
70 dB Negative responses begin in the body. The autonomic nervous system kicks in.

Noise over 70 dB Increases the risk of heart attack by 20%

Noise over 90 dB As this intense sound bombards the body, the adrenaline reaction is so powerful that people become openly hostile and belligerent.

120 dB Standing behind a Boeing 707 while it is in full thrust, just before takeoff. Hearing loss can occur after just 7.5 minutes.

120 - 130 dB Sound threshold for pain

120 - 140 dB Inside the average street boom car. Boom cars with higher levels are usually seen in dB "drag racing" competitions.


Based on the above info, I used a decibel meter on my car. Found out that my normal listening is around 87 decibels. Pushing it I was able to hit 100 decibels. At this point, my ears were already starting to hurt. Could have pushed it more but did not want to risk hearing loss. Should have used ear muffs.

Over all not bad for a system that only gets 50 watts per channel for the fronts and a single 10 inch sub fed only with 100 watts.

practice safe sound

[chua_riwap]

Hmmmmm......ma-measure nga yung db level nung boses ng biyenan ko.

[Radical!]

This should be a cause for concern, esp. for motorcycle riders like me...Just wind noise alone on freeway speeds is 90 db up. Include engine noise and endcan noise puts riders in toxic levels...that's why some people use noise suppressing earplugs.

I read in C! magazine that a Hyundai Santa Fe's cabin noise is at 82 db running 85 kph on asphalt. Pretty good...

[mbeige]

Which leads me to a question. What about high frequency soundwaves that aren't really that audible to us pero it can cause damage? I'm talking about ultrasonic frequencies such as those used in ultrasonicators or radiowaves, etc?

[userfriendly]

add ko lang.

Perceptions of Increases in Decibel Level
Imperceptible Change 1dB
Barely Perceptible Change 3dB
Clearly Noticeable Change 5dB
About Twice as Loud 10dB
About Four Times as Loud 20dB

[GlennSter]

Which leads me to a question. What about high frequency soundwaves that aren't really that audible to us pero it can cause damage? I'm talking about ultrasonic frequencies such as those used in ultrasonicators or radiowaves, etc?

patugtog ka ng 33mhz sa kotse with your sub...tapos magpaupo ka ng babaeng gusto mo.....

tell her to "feel" the bass....tingnan natin kung hindi mapahiyaw sa sarap =p

[OTEP]

I did a db check on my Pajero when the system was new. Even when playing loud, thumpin, music I was rarely exceeding 85db.

[3sgTe]

eto kaya ok pa ba mga ganitong busina??

hehehehe!

http://www.youtube.com/watch?v=ZS1t1MQr9pQ

http://www.youtube.com/watch?v=BkJwcR21VLk

[russpogi]

Hmmmmm......ma-measure nga yung db level nung boses ng biyenan ko.

Hahahaha!!!!!

[mbeige]

patugtog ka ng 33mhz sa kotse with your sub...tapos magpaupo ka ng babaeng gusto mo.....

tell her to "feel" the bass....tingnan natin kung hindi mapahiyaw sa sarap =p

I thought women didn't like low frequency sounds like bass? Parang there was a study about sound frequency and affinity with males/females. Males like the lower sounds kaya puro bass and loud exhaust notes. Women like the higher sounds kaya sensitive sila sa matinik na tunog.

[Alpha_One]

I thought women didn't like low frequency sounds like bass? Parang there was a study about sound frequency and affinity with males/females. Males like the lower sounds kaya puro bass and loud exhaust notes. Women like the higher sounds kaya sensitive sila sa matinik na tunog.

Well, 33MHz is hardly bass.

It would be quite a challenge to play a 33MHz tone on your sub however, they're lowpassed. besides, the equipment they're attached to aren't designed to have any 33MHz response...

[GlennSter]

33 mhz is barely audible....

but there was a claim that it can make a girl orgasm after several minutes inside the car. =)

[fukengruven]

sa dbdrag nakaupo na ko sa isang car na nag 150db.. sobra sakit sa tenga :D bitol ko 134-143db sa meter

[Alpha_One]

33 mhz is barely audible....

but there was a claim that it can make a girl orgasm after several minutes inside the car. =)

33MHz is ultrasound. Even bats can only hear up to 100KHz.

I think the original claim is 33Hz. 33MHz is a million times that. If my 8 units (so far) of the relevant EE are not wrong, it would be impossible to produce a 33MHz signal with the subwoofer (which are usually lowpassed to produce bass frequencies only). Ultrasound equipment, maybe, car stereos, no. I've never heard a woman squeal while having an ultrasound...

EDIT: http://en.wikipedia.org/wiki/Brown_note related stuff...

[userfriendly]

33 mhz is barely audible....

but there was a claim that it can make a girl orgasm after several minutes inside the car. =)

I belive you are refering to 33hz not 33mhz.

Anyone tried this? Might be a nice experiment

[GlennSter]

33MHz is ultrasound. Even bats can only hear up to 100KHz.

I think the original claim is 33Hz. 33MHz is a million times that. If my 8 units (so far) of the relevant EE are not wrong, it would be impossible to produce a 33MHz signal with the subwoofer (which are usually lowpassed to produce bass frequencies only). Ultrasound equipment, maybe, car stereos, no. I've never heard a woman squeal while having an ultrasound...

EDIT: http://en.wikipedia.org/wiki/Brown_note related stuff...

HZ it is!

[oldblue]

Found this info. http://www.lowertheboom.org/trice/safedblevels.htm

Proposed safe sound levels:
85 dB and higher - prolonged exposure will result in hearing loss
90 dBA - no more than 8 hours per day (examples - lawn mower, truck traffic, hair dryer)
95 dBA - no more than 4 hours per day
100 dBA - no more than 2 hours per day (example - chain saw)
105 dBA - no more than 1 hour per day
110 dBA - no more than ½ hour per day
115 dBA - no more than ¼ hour per day (preferably less)
140 dBA - NO EXPOSURE TO IMPACT OR IMPULSE NOISE ABOVE THIS LEVEL (examples - gunshot blast, jet plane at takeoff)


The National Campaign for Hearing Health's Toxic Noise Guidelines (exposure times and decibel levels that cause hearing loss)

85 dB 8-hour period
85 - 90 dB 2-hour period
90 - 100 dB 1 to 2-hour period
100 - 110 between 2 and 15 minutes
110 - 120 less than 30 seconds
130 dB ANY EXPOSURE WILL RESULT IN PERMANENT HEARING LOSS

From http://www.lowertheboom.org/trice/decibels.htm
70 dB Negative responses begin in the body. The autonomic nervous system kicks in.

Noise over 70 dB Increases the risk of heart attack by 20%

kaya pala meron mga tao, kahit casual na nagsasalita lang, parang bumibilis ang pumping ng puso ko. parang gusto ko batukan